Buffing-roll



(No Mode1. H. A..WBBST.BR.

BUPFING ROLL.

No. 493,001. Patented Maan-1, 1893.

' INVENTUR:

UNTTEE STATES PATENT OFFICE.

HAROLD A. WEBSTER, OE HAvERHILL, ASSIGNOR To GEORGE H. P. ELAGG,

' OE BOSTON, MASSACHUSETTS.

BUFFIN'G-ROLL.

SPECIFICATIONforming part of Letters Patent No. 49 8,001, dated March 7,1893. Application filed October 18, 1892.. Serial No.449121'7. (Nomodel.)

To a/ZZ whom t may concern:

Be it known that I, HAROLD A. WEBSTER, of Haverhill, in the county ofEssex and State of Massachusetts, have invented certain new and usefulImprovements in Bufting Rolls or Cylinders, of which the following is aspecilication.

This invention has for its object to provide a bufting roll or cylinderhaving an abrasive periphery yieldingly supported by a constantlymaintained air cushion; and it consists in a bufting roll or cylindercomposed of a rotary shaft having an internal airpassage and peripheralrings or collars, and a yielding covering supported by said collars, thesaid covering and the end collars constituting an air chamber, whichreceivescompressed air from an air pump or forcing apparatus, and keepsthe yielding covering suitably distended and yieldingly supported, theyielding covering having a facing or coating of a suitable abrasivematerial,such as sand-paper'.

Of the accompanying drawings, forming part of this specification:Figurelrepresents a longitudinal section of a buttng roll embodying myinvention, showingA the bearings which support the shaft of the roll.Fig. 2 represents a section on line 2-2, Fig..1, looking toward theright. Fig. 3 represents a section on line 3 3, Fig. 1. Fig. 4represents a side elevation of an organized machine embodying myinvention.

The same letters and numerals of reference indicate the same parts inall the figures.

In the drawings: a represents a rotary shaft, which is journaled insuitable bearings b b, and is provided with a longitudinal air channelb', which may be connected in any suitable way with an air pump orforcing apparatus. I have here shown a pipe c, communieating with achamber b2 in one of the bearings b, said chamber-communicating with theair passage b. The pipe c extends from a suitable air pump, not shown.Said pump may be driven by the power that rotates the shaft a, so that,when the shaft and cylinder are in operation, there will be a constantsupply of air to keep the bufting surface of the cylinderproperly-supported.

d d represent collars or heads, preferably of rigid material, affixed tothe shaft, and d repare provided for detachably securing the" Vabrasivesheet or layer 3, said means, as here shown, being a wedge-shaped bar e,extending lengthwise ofthe cylinder and formed to tit in notches fformed in the heads d. The inner thickness 2 of the exible covering ispermanently pressed into the notches f, the

portion thus displaced constituting a V-' shaped trough, extendinglengthwise of the roll. In securing the outer abrasive layer` 3, the bare is rst removed and the sheet of abrasive material is Wrapped aroundthe permanent inner layer2, and then tightened and secured by forcingthe bar into the said trough, portions of the abrasive sheet beingforced into the trough with the bar, as indicated in Figs. 1, 2 and 3.The ends of the bar are oftset and provided with ears o r lugs e e',which are engaged with cams e2, which are adapted to rotate on collarse3 formed on the heads d. By turning said cams in one direction, the bare is drawn inwardly, While by turning said cams in the oppositedirection the bar is released and its removal is permitted. It will beseen that, when air under pressure is forced into the air chamber thusformed, it presses outwardly on the flexible covering, and thusconstitutes a yielding and constantly-maintained cushion supporting theabrasive material.

When the roll is of considerable length, so that the pressureof thearticle to be buffed or treated upon the yielding periphery of the rollwould tend to unduly sink or displace said periphery, I provide one ormore yielding supports for the said periphery, at points between the endcollars or heads d d. Said yielding supports are preferably disks t' t',of felt or other similar material, secured to the IOO , having an airpassage, headsorcollars affixed` to said shaft, anda yielding or,flexible `cylin.- drical covering affixed to said heads and pro- .lvided with an abrasive coating, said heads' and flexible .coveringinclosing an air space4 shaft a by means of iianged collars t" i', and

clamping plates 2 secured by belts t3. kThe yielding disks e7 are ofsuch diameter that they do not extend out to the inner surface of theyielding covering when the latter is in its normal position, andparticularly when it is distended by the internal air pressure, .theobject t of said disks being to furnish a yielding sup- 3 port for theabrasive material inthe event of extreme displacement of the latter byexternal pressure.

It Will be seen that, by providing a bufng roll with an air cushionwhich is constantly l maintained when the roll is in operation, Iigreatly simplify the construction of the roll and make it more durableand effective for bufling purposes than rolls made as heretofore inwhich the abrasive material 'is cushioned Wholly by felt or other likematerial.

In Fig. 4, I show the improved bning rolls mounted upon a central shaft,which is jour- I? naled in bearings in a supporting-frame j.` The airpump which supplies the internal i pressure in the buiing rolls may beaiiixed to 1 said frame, if desired. l

I do not limit myself to the described .dey tails of construction, andmay vary the same Without departing from the spirit ,of Iny iny vention.

I claim-,-

I. A buflng roll, comprising a rotary shaft communicating with airpassage in the shaft, combined with means Ywhereby air under pressuremay be admitted into said passage to press outwardly and yieldinglysupport the flexible covering, as set forth.

2. A buing roll comprising a rotary shaft having an air passage, headsor collars affixed to said shaft, a yielding cylindrical covering aixedto said heads, said covering and heads constituting an air chambercommunicating l with the passage in the shaft, and one or more yieldingsupports aiixed to the shaft within said chamber, as set forth.

3. A buiing yroll comprising a rotary shaft having an air passage, headsor collars affixed to said shaft, an inner iexible covering permanentlyattached to said head, and means fOI deffachably 4securing an abrasivecovering t0 Said inner covering, as set forth.

4. A `;b uiilng roll comprising a rotary shaft, heads or collarsaxedthereto and provided lwith notches, a flexible .covering axed `toSaid heads and entering said notches, a `Wedgeshaped bar formed t0 enter'Said notches as a :means for detachably securing an abrasive covering,and rotatable cams engaged with the ends of said bar, as set forth.

In testimony whereof l have signed my name to this specification, in thepresence of two subscribing Witnesses, this `15th day of October, A, D,1892.

HAROLD A. WEBSTER. Witnesses: LG. F. BROWN, M. W. JACKSON.

